Black shower grout in Dubai: DIY or professional fix?« Back to Previous Page

That black grout is a classic sign of a persistent mould issue, common in Dubai bathrooms due to the high humidity and constant condensation from hot showers and year-round AC use. Bleach only removes surface colour; it doesn't kill the root structure penetrating the porous grout.

For a small, surface-level area, a dedicated mould-removing grout cleaner from a hardware store can be effective. Look for an alkaline-based product, as these are often more effective on mould than acidic cleaners. The key is proper application: let the product sit on the grout for the full recommended dwell time to penetrate before scrubbing and rinsing.

However, if the discolouration returns quickly after a thorough cleaning, it strongly suggests the mould has spread behind the tiles. In a villa, this is a significant concern as the moisture can migrate into the wall structure itself. At this point, DIY solutions are a temporary fix.

You need a professional assessment. A certified inspector uses moisture meters and borescopes to see behind the tiles without causing damage. This confirms the extent of the problem. Remediation for established mould behind tiles typically involves removing the affected grout and tiles, treating the cavity, and replacing the waterproofing membrane—a job for specialists to prevent recurrence.

Cost is entirely dependent on the square footage affected and the extent of the hidden damage. For a precise scope and quote, you should request an on-site inspection from a company that can provide documented findings and a clear remediation plan.